For the adults: Studies are limited and inconsistent. One research does suggest that adults laugh an average of 17.5 times per day (Martin RA, Kuiper NA. Daily occurrence of laughter: Relationships with age, gender, and Type A personality. Humor: International Journal Of Humor Research 1999; 12 (4): 355-84.)
Both adults and children laugh primarily during social interactions with others. Consequently, the frequency of laughter at any age depends on how much time an individual spends interacting with others.
How rumors spread: true origins of a false scientific quote
It appears to have all started with Dr Michael Titze, a German Psychotherapist and pioneer in the world of therapeutic humor. Here is what Dr Titze himself had to say about this misquote:
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Discover Laughter Wellness, a complete system of methods (lifestyle medicine) that promotes physical, mental, emotional and social health and wellbeing through laughter and associated empowering techniques. Laughter Wellness is designed to lessen the illness impact and help normalize people’s lives.
About the author: Sebastien Gendry is the founder and CEO of the Laughter Online University as well as The Laughter Consultants, Inc., a business dedicated to helping those organizations who wish to boost moral and productivity, or reduce stress and costs. A leading global expert on Laughter Therapy, he helps individuals and businesses introduce and/or re-establish the energy of laughter in their lives and work for better health, wellbeing and peak performance. Sebastien has over 10 years of full-time experience in his field working with 1000s on four continents.